CN111576235A - BIM-based No. 0 block longitudinal prestressed pipeline positioning construction method - Google Patents
BIM-based No. 0 block longitudinal prestressed pipeline positioning construction method Download PDFInfo
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- CN111576235A CN111576235A CN202010480163.XA CN202010480163A CN111576235A CN 111576235 A CN111576235 A CN 111576235A CN 202010480163 A CN202010480163 A CN 202010480163A CN 111576235 A CN111576235 A CN 111576235A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a BIM-based construction method for positioning a No. 0 block longitudinal prestressed pipeline, which mainly comprises the following steps: the method comprises the steps of BIM modeling → support system installation → bottom mold template installation → support pre-pressing → steel bar binding and prestressed pipeline installation → No. 0 block end mold template installation and adjustment → concrete pouring and maintenance, and comprises the steps of simulating the positions of a No. 0 block prestressed pipeline and steel bars by adopting a BIM technology, checking collision points, optimizing and adjusting the positions of the steel bars in advance, ensuring accurate positioning of the prestressed pipeline, and aiming at solving the technical problems of untightness of the prestressed pipeline hole position structure, poor positioning accuracy and low construction efficiency.
Description
Technical Field
The invention relates to the technical field of continuous beam construction, in particular to a BIM-based construction method for positioning a No. 0 block longitudinal prestressed pipeline.
Background
Along with the development of municipal industry and the continuous improvement of construction technology, green, environment-friendly, economic and reasonable construction technology is more emphasized. For bridge engineering adopting a prefabricated section assembling technology, assembling precision requirements are more strict, wherein assembling precision of a cast-in-place No. 0 block and a prefabricated No. 1 block determines cross slope, longitudinal slope and overall line type of a bridge; the key technical point for determining the assembling quality of the No. 0 block and the No. 1 block is the quality of the longitudinal corrugated pipe hole channel positioning of the No. 0 block.
The density of No. 0 steel bars and prestressed pipelines of the cast-in-place beam is increased, the traditional construction method cannot ensure the concrete pouring quality of the No. 0 support, and the technical problems of exposed steel bars, honeycomb pitted surfaces on the concrete surface and poor construction quality of concrete often occur after the form is removed, so that the construction quality of the beam body is seriously influenced; therefore, aiming at the problems existing in the traditional construction method of the cast-in-place beam, a plurality of processes such as a No. 0 block construction template, an internal mold supporting system, a vibration mode, prestressed pipeline positioning and the like are researched.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a construction method for positioning a No. 0 block longitudinal prestressed pipeline, which can improve the accurate positioning of a No. 0 block cast-in-place prestressed pipeline on the pier top and does not influence the later penetrating long beam; the method can avoid the technical problems of unsmooth prestressed pipeline hole position structure, poor positioning precision and low construction efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
a BIM-based construction method for positioning a No. 0 block longitudinal prestressed pipeline is designed, and comprises the following steps:
1) BIM modeling: firstly, drawing BIM graphs of No. 0 steel bars and prestressed pipeline hole positions, finding out collision positions, optimizing the No. 0 steel bars, accurately designing the No. 0 end die template and the prestressed pipeline hole positions and simulating trial assembly; extracting relevant measurement and trial-pieced data;
2) installing a support system: determining the height-width ratio of a cast-in-place support according to the height of the No. 0 block bottom die template, and further determining the material, the number, the size and the assembling position of the No. 0 block cast-in-place support; determining the elevation of the cast-in-place support by measuring the basic deformation, the elastic deformation and the inelastic deformation of the cast-in-place support;
3) bottom die template installation and support prepressing: after the support system is installed, laying a main keel, a secondary keel and a bottom die template of a bottom plate membrane plate, and then performing a pre-pressing test on the support system; laying secondary keels of the bottom die template at the positions of the No. 0 bottom die template and the No. 0 web plate along the longitudinal bridge direction, and laying main keels along the transverse bridge direction; measuring settlement and shift of loading and unloading of the support layout point position, and then monitoring settlement of the support in every 24 hours after pre-pressing, total settlement of 72 hours and rate of change of the settlement to test elastic deformation; and eliminating the inelastic deformation of the bracket by preloading;
4) binding steel bars and installing prestressed pipelines: after the lining pipe penetrates into the prestressed pipeline while binding the steel bars, linearly adjusting the prestressed pipeline to ensure that the position and elevation of the No. 0 bottom die template and the internal size and relative position of the bottom die template meet the design requirements, and reserving a position matched with the No. 0 end die template according to the shape and size of the No. 0 end die template;
5) and (3) installing and adjusting a No. 0 block end die template: accurately positioning the No. 0 block end mold template by using a total station, accurately measuring the contour line of the No. 0 block end mold template, marking the No. 0 block bottom mold template and the bottom mold template at the No. 0 block web plate, and installing the No. 0 block end mold template; positioning, rechecking and adjusting four corners of the periphery of the No. 0 block end die template and the position of the reserved prestressed pipeline hole during installation so as to ensure that the joint of the No. 0 block end die template does not leak slurry or seep water; positioning and checking the position of a prestressed pipeline hole corresponding to the No. 0 block end die template so as to ensure accurate positioning and linear smoothness of the prestressed pipeline hole position;
6) pouring and maintaining concrete: when the concrete pouring construction is carried out, layered continuous pouring or pushing continuous pouring is adopted; the concrete is vibrated obliquely along the pouring direction, the horizontal inclination angle of a vibrating rod is 55-65 degrees, the rod head of the vibrating rod faces the construction advancing direction, and the distance between the rod heads is 45-55 cm; and drawing out the lining pipe when the strength of the initially set concrete is at least 1.5 MPa.
Preferably, in the step 3), the support preloading is heavy preloading, the limit load of the support preloading test is 1.05-1.15 times of the structural load, the loading weight deviation is controlled within 5% of the load at the same level, and the load is loaded in a grading manner according to the concrete pouring sequence; monitoring during the support pre-compaction, the monitoring includes that the basis subsides to warp, support vertical displacement, support top surface horizontal displacement, the monitoring of the amount of deflection of beam column support girder, the amount of deflection of beam column support crossbeam, neighbour's structure warp.
Further, before carrying out the support pre-compaction test, set up two rows of monitoring points to the longitudinal bridge on the support, the monitoring point sets up the length position in pre-compaction regional both ends and interval 1/4 pre-compaction region, and the intermediate point of monitoring point is located stride footpath central point and puts, and the monitoring section that every monitoring point formed includes 5 monitoring points at least.
Preferably, in the step 4), the bottom die template at the position of the bottom die template No. 0 and the bottom die template at the position of the web plate No. 0 are formed by splicing double-sided film-coated bamboo plywood with the thickness of 18-22 mm and the length and width of 80-120 multiplied by 80-120 mm, the double-sided film-coated bamboo plywood forms a bottom plate plywood into an upward convex multi-side arc structure, and the distance between two adjacent plywood is 190-210 mm; the distance between the two adjacent main keels is 800-1000 mm.
Preferably, the step 4) of binding the reinforcing steel bars comprises the following steps:
firstly, popping out skeleton reinforcing steel bar ink lines according to a design drawing, and binding a bottom plate reinforcing steel bar and a web plate reinforcing steel bar;
installing longitudinal and vertical prestressed pipelines, wherein the prestressed pipelines adopt corrugated pipes, the vertical prestressed pipelines penetrate prestressed finish-rolled twisted steel bars in advance, if the corrugated pipes conflict with the prestressed pipelines and the finish-rolled twisted steel bars, the twisted steel bars are cut off, bent or shifted, and if the twisted steel bars are cut off, reinforced reinforcement is adopted;
after the bottom plate reinforcing steel bars, the web plate reinforcing steel bars and the corresponding prestressed pipelines are bound and positioned, a No. 0 inner box template and a people passing hole core template are installed, and then the top plate reinforcing steel bars and the No. 0 top prestressed pipelines are bound.
Preferably, in the steel bar binding process in the step 4), positioning steel bars with the spacing of 45-55 cm are adopted for fixing, the encryption spacing of the positioning steel bars at the turning point of the prestressed pipeline is 25-35 cm, and the welding position of the positioning steel bars is accurately positioned by calculation of the prestressed pipeline coordinates and measurement of a tool; the positioning steel bars adopt 'well' -shaped steel bars or 'U' -shaped steel bars so as to ensure the linear shape of the prestressed pipeline and the accurate position of the opening.
Preferably, in step 4), reinforcement and prestressed pipe are pre-buried to go on simultaneously to whole journey measurement prestressed pipe elevation of total powerstation, position and linear, set up the mark on bottom plate template, control prestressed pipe is at 100 ~ 150mm to the distance of bottom plate template and web department, adjusts corresponding reinforcing bar and prestressed pipe's position at any time, avoids colliding, reduces the reinforcing bar and cuts apart, avoids pre-buried prestressed pipe to lack the condition of working face simultaneously.
Preferably, in the step 5), the panel of the No. 0 end die template is a hot-rolled steel plate with the thickness of 7-9 mm, the frame and the rib plate of the No. 0 end die template are welded to be flat steel with the length and width of 10 × 80, the transverse reinforcing rib uses channel steel, the No. 0 end die templates are connected through bolts, and the No. 0 end die templates are positioned and fixed through section steel template supports.
Preferably, in the step 5), the lining pipe is a PE pipe, the lining pipe and the prestressed pipeline are fixed by two U-shaped steel plates with the thickness of 4-6 mm, the lining pipe and the prestressed pipeline are welded to the periphery of the No. 0 block end die template after the elevation is measured and positioned by a guiding rule, and the periphery of the prestressed pipeline hole and the gap of the prestressed pipeline are filled with foamed glue.
Preferably, the joint of the prestressed pipeline is smooth, the joint length is not less than 10 times of the diameter of the prestressed pipeline, the periphery of the joint of the prestressed pipeline is tightly wound by an adhesive tape, slurry is prevented from entering the prestressed pipeline, positioning steel bars are additionally arranged at the flat bending section of the prestressed pipeline, the vertical interval between two adjacent positioning steel bars is 110-130 mm, and the transverse interval is 130-150 mm.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the invention firstly adopts BIM technology to simulate the position of the No. 0 prestressed pipeline and the steel bar, checks the collision point, can optimize and adjust the position of the steel bar in advance, and ensures the accurate positioning of the prestressed pipeline. The transverse end die template is a shaped steel template, is combined with the section beam prefabricated part in advance, is matched with the No. 1 block, and then is reserved with a corrugated pipe hole, so that the transverse end die template is accurately matched with the No. 1 block during field assembly. On the premise that the bottom die template of the No. 0 block meets the strength, the position of the hole of the prestressed pipeline is calculated, and the hole is reserved after the prestressed pipeline is accurately positioned on the bottom die template, so that the problems of unsmooth prestressed pipeline, dislocation in the hole, hole expansion and skylight opening during assembly of the No. 1 block are reduced, the prestress loss is caused, the durability and the structural safety of the bridge are reduced, the strand penetrating quality and efficiency of steel strands are improved, and the construction progress is accelerated.
2. In the whole process, the total station is adopted to position and loft the bottom die template, the prestressed pipeline trend and the positioning reinforcing steel bars, and the auxiliary tape measure is adopted to measure, so that the working difficulty of mounting the prestressed pipeline is reduced; the positioning method of 'four-step walking' of the total station auxiliary tape is adopted in the whole process, so that the technical problems of hole channel dislocation and difficulty in strand penetration of steel strands in the later process when a cast-in-place No. 0 block and a prefabricated segmental beam are assembled are solved efficiently and accurately; the steel bar binding and the cross construction of the prestressed pipeline are more reasonable and coordinated.
3. According to the invention, the high-precision and high-strength shaped integral bottom die template with the reserved prestressed pipeline hole positions is adopted at the two transverse ends, the integral bottom die template has high rigidity and good stability, the accuracy and precision of the prestressed pipeline hole position positioning are improved, the construction process is simplified, and the construction efficiency is greatly improved; and can better bear the side pressure of No. 0 block concrete pouring.
4. The prestressed pipeline adopts the corrugated pipe, and the corrugated pipe can play a supporting role in the prestressed pipeline, so that the section size of the pipeline is correct and does not deform after the No. 0 prestressed pipeline is poured by concrete; the method of welding the well-shaped or U-shaped positioning steel bars ensures that the prestressed pipelines and the steel bars cannot be displaced during binding, and the linear trend is accurate and more reasonable.
Drawings
FIG. 1 is a front view of the block 0 of the present invention.
FIG. 2 is an elevation view of block No. 0 of the present invention.
FIG. 3 is a front view of the No. 0 block end die template of the present invention.
FIG. 4 is a schematic view of a settlement observation point according to the present invention.
Fig. 5 is a concrete casting schematic view of the present invention.
In the figure, 1.0 number block end mould template, 2 number section steel support, 3 number inner mould template passing through the manhole, 4 number zero block inner box template, 5 number bottom mould template at the web plate, 6 number end mould template at the wing plate, 7 number protective railing, 8 number plate buckle support.
Note: in fig. 5, (a) layered continuous casting, and (b) pushing continuous casting.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way. The processing and manufacturing methods (testing, preparation methods and the like are selected according to the situation) are conventional methods unless otherwise specified.
Example 1: a BIM-based construction method for positioning a No. 0 block longitudinal prestressed pipeline comprises the following steps of:
1) the BIM modeling is utilized, namely BIM graphs of the position of a No. 0 steel bar and a prestressed pipeline hole are drawn firstly, the collision position is found out, the position of the steel bar is optimized, the position of the steel bar can be optimized and adjusted in advance, and the prestressed pipeline is ensured to be accurately positioned; the total station is adopted to position and loft the bottom die template, the prestressed pipeline trend and the positioning reinforcing steel bars in the whole process, and the tape measure is assisted to measure, so that the working difficulty of mounting the prestressed pipeline is reduced; performing precision design on the No. 0 block end die template and the prestressed pipeline hole position and simulating trial splicing; and extracting the measurement data and trial splicing data of the No. 0 block end die template and the prestressed pipeline hole position.
2) Installing a support system: determining the height-width ratio of a cast-in-place support according to the height of the No. 0 block bottom die template, and further determining the material, the number, the size and the assembling position of the No. 0 block cast-in-place support; determining the elevation of the cast-in-place support by measuring the basic deformation of the support, the elastic deformation and the inelastic deformation of the support; the elevation and the stability of the support determine the reference surface of the total elevation of the prestressed pipeline of the block 0 and the positioning accuracy of the end die template of the block 0.
3) Bottom die template installation and support prepressing: the secondary keels of the bottom die template at the positions of the No. 0 bottom die template and the No. 0 web are laid along the longitudinal bridge direction, and the main keels are laid along the transverse bridge direction; laying a bottom die template on the secondary keel; after the support system is installed, and the main keel, the secondary keel and the bottom die template of the bottom plate template are laid, a prepressing test is carried out on the support system; measuring settlement and shift of loading and unloading of the support layout point position, and then monitoring settlement of the support in every 24 hours after pre-pressing, total settlement of 72 hours and rate of change of the settlement to test elastic deformation; and eliminating the inelastic deformation of the bracket by preloading;
the number 0 bottom die template and the bottom die template at the web plate are preferably spliced by adopting square wood double-faced film-coated bamboo plywood with the thickness of 20mm and the length and width of 100 multiplied by 100mm, and the distance between two adjacent veneers is 200 mm; the interval between two adjacent main keels is 900 mm.
Prepressing the bracket by adopting a sandbag surcharge loading mode, wherein the limit load of a bracket prepressing test is 1.1 times of the structural load, the loading weight deviation is controlled within 5 percent of the soil of the same level of load, and the load is loaded in a grading manner according to the concrete pouring sequence; monitoring the vertical direction and the horizontal direction during support prepressing, wherein the monitoring comprises monitoring of foundation settlement deformation, support vertical displacement, support top surface horizontal displacement, deflection of a beam-column support longitudinal beam, deflection of a beam-column support transverse beam and deformation of a neighboring structure.
The support is provided with two rows of monitoring points in the longitudinal bridge direction, the monitoring points are arranged at two ends of the prepressing area and at the length position of the interval 1/4 prepressing area, the middle point is located at the center position of the span, and at least 5 monitoring points are arranged on the monitoring section formed by each monitoring point and the point surface of the support corresponding to the center line of the concrete beam.
4) Binding steel bars and installing prestressed pipelines: after the lining pipe penetrates into the prestressed pipeline while the steel bars are bound, linearly adjusting the prestressed pipeline to ensure that the position and elevation of the No. 0 bottom die template and the internal size and relative position of the bottom die template meet the design requirements, and reserving a position matched with the No. 0 end die template according to the shape and size of the No. 0 end die template;
carry out ligature reinforcing bar when die block template is laid, ligature reinforcing bar includes following step:
popping up a skeleton reinforcing steel bar ink line according to a design drawing, and binding the bottom plate reinforcing steel bar and the web plate reinforcing steel bar;
installing longitudinal and vertical corrugated pipes, and simultaneously pre-penetrating the vertical corrugated pipe into a prestressed finish-rolled twisted steel bar, wherein if a steel bar which conflicts with the corrugated pipe exists, the steel bar needs to be cut off, bent or shifted;
treat bottom plate reinforcing bar, web reinforcing bar and prestressing force pipeAfter the passage is finished, the box chamber and the core mould of the manhole are installed, and then the top plate steel bars and the prestressed pipeline are bound. The position in No. 0 block is to wearing inside lining PE pipe, bellows inside lining PE pipe to carry out overall adjustment to its linearity, in order to ensure that position, elevation of die block template, the inside dimension and the relative position of die block template accord with the design requirement, reserve the position of matcing with No. 0 block end die template according to the shape and the size of No. 0 block end die template.
In the process of binding the reinforcing steel bars, positioning reinforcing steel bars with the spacing of 50cm are adopted for fixing, the encryption spacing of the positioning reinforcing steel bars at the turning point of the prestressed pipeline is 30cm, and the welding position of the positioning reinforcing steel bars is accurately positioned by calculating the coordinates of the prestressed pipeline and measuring by a tool; the positioning steel bars adopt the 'well' -shaped steel bars or the 'U' -shaped steel bars so as to ensure the linearity and the accurate position of the corrugated pipe.
Reinforcement and bellows are pre-buried to go on simultaneously, and bellows elevation, position and the linear are measured to the total powerstation whole journey, set up the mark at the bottom plate, and the accurate control bellows is to the distance of bottom plate and web, adjusts reinforcing bar and bellows position at any time, avoids colliding, reduces the reinforcing bar and cuts off, does not have the condition of working face when avoiding pre-buried bellows again.
5) Installing and adjusting an end die template: before the No. 0 block end die template is installed, accurately positioning by using a total station, accurately measuring the contour line of the No. 0 block end die template, marking a bottom die and a side die, and then installing the No. 0 block end die template; when the end die is installed, the four corners of the periphery of the No. 0 block end die template and the positions of the reserved prestressed pipeline holes are positioned, rechecked and adjusted so as to ensure that the installation joints of the end die template are free from slurry leakage and water seepage; and positioning the prestressed pipeline hole position corresponding to the end mold template and checking the position with the last positioning so as to ensure that the prestressed pipeline hole position opening is accurately positioned and is linearly smooth.
The panel of the No. 0 end die template is a hot rolled steel plate with the thickness of 7-9 mm, the frame and the rib plate of the No. 0 end die template are welded with flat steel with the length and width of 10 multiplied by 80, the transverse reinforcing rib uses No. 12 channel steel, the No. 0 end die templates are connected through M18 high-strength bolts, and the bottom die template is positioned and fixed by a steel plate support; when the No. 0 block end die template is processed and produced, the block blanking, the block splicing, the frame punching, the integral assembling and the spot welding are connected into a whole, the assembling is required before the installation, and the No. 0 block end die template is polished, rusted and coated with a release agent.
And (3) positioning the prestressed pipeline hole position of the No. 0 block end template: the method comprises the following steps that a PE pipe lined in a corrugated pipe penetrates through a No. 0 block end die template and then is fixed by two U-shaped steel plates, wherein the thickness of each steel plate is 4-6 mm; and measuring the well-positioned elevation by using a guiding rule, welding the elevation to the periphery of a prestress hole outside the end die template and filling gaps of the corrugated pipe with foam rubber.
Preferably, the position of a prestressed pipeline hole of the No. 0 block end template is positioned: the inner lining PE pipe of the corrugated pipe penetrates through a No. 0 block end die template and then is fixed by two U-shaped steel plates, and the thickness of each steel plate is 5 mm; and measuring the well-positioned elevation by using a guiding rule, welding the elevation to the position of a prestress hole outside the No. 0 block end die template, and filling the periphery and the corrugated pipe gap with foam rubber.
6) Pouring and maintaining concrete: the construction of the concrete engineering adopts layered continuous casting or pushing type continuous casting; during construction, uniform subsection and layered pouring are carried out; the concrete is vibrated obliquely along the pouring direction, the horizontal inclination angle of a vibrating rod is 60 degrees, the rod head of the vibrating rod faces the construction advancing direction, and the distance between the rod heads is 50 cm; and after the concrete is initially set, drawing out the lining pipe, and removing the lining pipe until the concrete strength is not less than 1.5 MPa.
The joint of the prestressed pipeline needs to be smooth, the length of the joint is not less than 10 times of the diameter of the prestressed pipeline, the adhesive tape on the periphery of the joint of the prestressed pipeline is tightly wound to prevent slurry from entering the prestressed pipeline, and the vertical interval of 120mm and the horizontal interval of 140mm are additionally arranged on the flat bending section of the prestressed pipeline.
The positioning steel bar is a hot rolled ribbed steel bar with the main diameter of 12 mm. The figure 1 also comprises a plate buckle support, a protective railing, a wing plate end mold template, a wing plate bottom mold template, a zero number block No. 0 end mold template, a profile steel support and other structures.
Examples of effects
End mold template quality control measure
(1) The adopted end die templates are all designed according to No. 0 block drawing paper of the pier top by adopting a customized steel model; the bottom die template is processed according to the strict technical specification, and a three-level acceptance procedure is carried out.
(2) The end mould template is vertical and firm, and the matched beam body curve is accurately positioned, thereby meeting the current requirements; the template block pieces are tightly assembled and connected without slurry leakage, and the quality requirement of repeated use is met. The reserved manhole inner mold template is firmly installed, and two adjacent end mold templates are effectively connected without slurry leakage.
(3) When the end die template is installed, a release agent is coated, a leakage-proof adhesive tape is attached, and the height difference, the flatness, the axis position, the size and the verticality are controlled.
(4) Before concrete pouring, the spatial position and the installation quality of the template are checked and accepted, and the installation quality of the template meets the standard requirements.
(5) When demoulding, the edges and corners of the beam body and the peripheral concrete of the embedded part are prevented from being damaged.
Prestressed pipeline quality control measure
(1) When the corrugated pipe is penetrated, the steel bar is avoided from the pipeline, and the position of the steel bar is slightly adjusted; if necessary, the steel bar can be cut off, then reinforcement is adopted, strength replacement, welding and other methods can be adopted, welding seams are checked, stress checking calculation is carried out, and the integral strength of the steel bar is ensured.
(2) When the steel bars are bound, corrugated pipe positioning is made in advance, and when the corrugated pipe penetrates through the steel bars, the position of the corrugated pipe is drawn on a template and the steel bars by chalk according to the distance from the center of a hole channel in a drawing to the center of a bottom die template, and the steel bars are welded with the positioning steel bars in a shape like a Chinese character 'jing'; after the positioning net (the steel bar support) is installed, the corrugated pipe penetrates into the grid of the positioning net, and the corrugated pipe is protected when being installed.
(3) The laying of the corrugated pipe is strictly controlled according to the coordinate position of a designed given pore passage, and the linear compliance of the prestressed pipeline is ensured.
(4) The bigger part of the corrugated pipe which is vertically deformed can be welded with a 'U' hook.
(5) The positioning reinforcing steel bars at the position of the end part of the corrugated pipe orifice, which is 10cm away from the template, can be properly encrypted.
(6) During the steel bar welding, should avoid burning the pipeline, during reinforcement, should avoid touching the pipeline and produce the displacement.
(7) And (5) timely carrying out through holes after concrete pouring.
(8) During the laying of the corrugated pipe, the pipe is ensured to have no sundries, and the opening of the pipe can be plugged by a sealing adhesive tape.
(9) The length of the corrugated pipe inserted into the bell mouth is not larger than the length of the straight line section of the bell mouth at the joint of the corrugated pipe and the bell mouth so as to influence the expansion of the steel strand and increase the friction resistance.
TABLE 1
The method combines the four ring sections of the Zhengzhou city and the western four ring sections of the rapid engineering of the big river road constructed by the applicant to construct the No. 0 block longitudinal prestressed pipeline positioning construction of the two-standard section engineering, innovatively adopts the No. 0 block shaped integral bottom formwork to replace the traditional wood formwork construction, combines the BIM technology to check the collision position of the corrugated pipe pore passage and the reinforcing steel bar in advance, optimizes in advance and successfully completes the accurate positioning of the No. 0 block longitudinal prestressed pipeline.
Taking the construction of the second standard section of the four ring sections of the Zhengzhou city four ring line and the great river path rapid engineering as an example, the method belongs to a municipal elevated project of capital construction of the Zhengzhou city urban and rural construction committee, and the Zhengzhou city is one of major projects of accelerating the promotion of traffic infrastructure in the construction of the central city of the country; the total construction cost of two standard sections for constructing four ring sections of a Zhenzhou city four ring section and a big river road rapid engineering is 19.8 hundred million, the planned construction period is 540 calendar days, the construction mileage is K81+ 162.322-K84 +891.731, the total construction period is 3.729km, the total construction period comprises 244 No. 0 blocks, and the construction method is adopted for positioning each cast-in-place No. 0 block longitudinal prestressed pipeline; the equipment and apparatus involved are shown in table 1. The construction of the project has not appeared so far because the number 0 block prestressed pipe location arouses assembles the quality problem. The number 0 block averagely reduces the labor required by the adjustment of templates, brackets, prestressed pipelines and the like by about 50 working days, and the cost is reduced by about 1 ten thousand yuan; the labor required for reworking caused by cross operation, prestress and steel bar position adjustment is reduced by about 90 working days, and the cost is reduced by about 1.8 ten thousand yuan; the labor required by post finishing caused by the position deviation of the prestressed pipeline is reduced by about 50 working days, and the cost is reduced by about 1 ten thousand yuan. The invention makes the construction of complex installation engineering more reasonable and orderly, reduces the difficulty, forms line production, accelerates the construction progress, greatly improves the production efficiency, ensures the construction quality, meets the environmental protection requirement, has more times of repeated utilization of the bottom die template, reduces the construction cost and generates good economic benefit.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variation ranges of the present invention, and will not be described in detail herein.
Claims (10)
1. A BIM-based construction method for positioning a No. 0 block longitudinal prestressed pipeline is characterized by comprising the following steps:
1) BIM modeling: firstly, drawing BIM graphs of No. 0 steel bars and prestressed pipeline hole positions, finding out collision positions, optimizing the No. 0 steel bars, accurately designing the No. 0 end die template and the prestressed pipeline hole positions and simulating trial assembly; extracting data of relevant measurement and trial assembly;
2) installing a support system: determining the height-width ratio of a cast-in-place support according to the height of the No. 0 block bottom die template, and further determining the material, the number, the size and the assembling position of the No. 0 block cast-in-place support; determining the elevation of the cast-in-place support by measuring the basic deformation, the elastic deformation and the inelastic deformation of the cast-in-place support;
3) bottom die template installation and support prepressing: after the support system is installed, laying a main keel, a secondary keel and a bottom die template of a bottom plate membrane plate, and then performing a pre-pressing test on the support system; laying secondary keels of the bottom die template at the positions of the No. 0 bottom die template and the No. 0 web plate along the longitudinal bridge direction, and laying main keels along the transverse bridge direction; measuring settlement and shift of loading and unloading of the support layout point position, and then monitoring settlement of the support in every 24 hours after pre-pressing, total settlement of 72 hours and rate of change of the settlement to test elastic deformation; and eliminating the inelastic deformation of the bracket by preloading;
4) binding steel bars and installing prestressed pipelines: after the lining pipe penetrates into the prestressed pipeline while binding the steel bars, linearly adjusting the prestressed pipeline to ensure that the position and elevation of the No. 0 bottom die template and the internal size and relative position of the bottom die template meet the design requirements, and reserving a position matched with the No. 0 end die template according to the shape and size of the No. 0 end die template;
5) and (3) installing and adjusting a No. 0 block end die template: accurately positioning the No. 0 block end mold template by using a total station, accurately measuring the contour line of the No. 0 block end mold template, marking the No. 0 block bottom mold template and the bottom mold template at the No. 0 block web plate, and installing the No. 0 block end mold template; positioning, rechecking and adjusting four corners of the periphery of the No. 0 block end die template and the position of the reserved prestressed pipeline hole during installation so as to ensure that the joint of the No. 0 block end die template does not leak slurry or seep water; positioning and checking the position of a prestressed pipeline hole corresponding to the No. 0 block end die template so as to ensure accurate positioning and linear smoothness of the prestressed pipeline hole position;
6) pouring and maintaining concrete: when the concrete pouring construction is carried out, layered continuous pouring or pushing continuous pouring is adopted; the concrete is vibrated obliquely along the pouring direction, the horizontal inclination angle of a vibrating rod is 55-65 degrees, the rod head of the vibrating rod faces the construction advancing direction, and the distance between the rod heads is 45-55 cm; and drawing out the lining pipe when the strength of the initially set concrete is at least 1.5 MPa.
2. The BIM-based No. 0 block longitudinal prestressed pipeline positioning construction method according to claim 1, characterized in that in the step 3), the support preloading is performed by weight preloading, the limit load of the support preloading test is 1.05-1.15 times of the structural load, the loading weight deviation is controlled within 5% of the same-level load, and the loads are loaded in a concrete pouring sequence in a grading manner; monitoring during the support pre-compaction, the monitoring includes that the basis subsides to warp, support vertical displacement, support top surface horizontal displacement, the monitoring of the amount of deflection of beam column support girder, the amount of deflection of beam column support crossbeam, neighbour's structure warp.
3. The BIM-based construction method for positioning No. 0 block longitudinal prestressed pipelines according to claim 1, characterized in that two rows of monitoring points are arranged on the support in the longitudinal bridge direction before a support pre-pressing test is performed, the monitoring points are arranged at two ends of a pre-pressing area and at the length position of the pre-pressing area at an interval 1/4, the middle point of each monitoring point is located at the center of a span, and a monitoring section formed by each monitoring point at least comprises 5 monitoring points.
4. The BIM-based construction method for positioning No. 0 longitudinal prestressed pipelines of claim 1, wherein in the step 4), the No. 0 bottom die plate and the No. 0 bottom die plate at the web are spliced by double-faced film-coated bamboo plywood with the thickness of 18-22 mm and the length and width of 80-120 x 80-120 mm, the double-faced film-coated bamboo plywood forms a bottom plate film plate into an upward convex multi-faced arc structure, and the distance between two adjacent plywood is 190-210 mm; the distance between the two adjacent main keels is 800-1000 mm.
5. The BIM-based No. 0 block longitudinal prestressed pipe positioning construction method according to claim 1, wherein the step 4) of binding reinforcing steel bars comprises the following steps:
firstly, popping up a skeleton steel bar ink line according to a design drawing, and binding steel bars at a bottom plate and a web plate;
installing longitudinal and vertical prestressed pipelines, wherein the prestressed pipelines adopt corrugated pipes, the vertical prestressed pipelines penetrate prestressed finish-rolled twisted steel bars in advance, if the corrugated pipes conflict with the prestressed pipelines and the finish-rolled twisted steel bars, the twisted steel bars are cut off, bent or shifted, and if the twisted steel bars are cut off, reinforced reinforcement is adopted;
after the bottom plate reinforcing steel bars, the web plate reinforcing steel bars and the corresponding prestressed pipelines are bound and positioned, a No. 0 inner box template and a people passing hole core template are installed, and then the top plate reinforcing steel bars and the No. 0 top prestressed pipelines are bound.
6. The BIM-based construction method for positioning No. 0 block longitudinal prestressed pipe according to claim 1, wherein in the step 4), in the process of binding the steel bars, positioning steel bars with a distance of 45-55 cm are adopted for fixing, the encryption distance of the positioning steel bars at the turning point of the prestressed pipe is 25-35 cm, and the welding position of the positioning steel bars is accurately positioned by calculation of prestressed pipe coordinates and measurement of tools; the positioning steel bars are U-shaped steel bars in a shape like a Chinese character 'jing' so as to ensure that the linear shape of the prestressed pipeline and the position of the opening are accurate.
7. The BIM-based construction method for positioning No. 0 longitudinal prestressed pipes according to claim 1, wherein in the step 4), steel bar binding and prestressed pipe pre-embedding are performed simultaneously, the elevation, position and line shape of the prestressed pipe are measured in the whole process of a total station, a mark is arranged on the bottom plate template, the distance from the prestressed pipe to the bottom plate template at the bottom plate template and the web is controlled to be 100-150 mm, the positions of the corresponding steel bars and the prestressed pipe are adjusted at any time, collision is avoided, steel bar cutting is reduced, and the condition that the pre-embedded prestressed pipe lacks a working surface is avoided.
8. The BIM-based construction method for positioning No. 0 longitudinal prestressed pipelines according to claim 1, wherein in the step 5), hot rolled steel plates with thickness of 7-9 mm are adopted for the face plate of the No. 0 end form, flat steel with length and width of 10 x 80 is welded on the frame and rib plates of the No. 0 end form, channel steel is used for transverse reinforcing ribs, the No. 0 end form is connected through bolts, and section steel form supports are adopted for positioning and fixing the No. 0 end form outside the No. 0 end form.
9. The BIM-based construction method for positioning No. 0 block longitudinal prestressed pipe according to claim 1, wherein in the step 5), the lining pipe is made of PE pipe, the lining pipe and the prestressed pipe are fixed by two U-shaped steel plates with the thickness of 4-6 mm, the lining pipe and the prestressed pipe are welded to the periphery of the No. 0 block end formwork after the height is measured and positioned by a guiding rule, and the periphery of the prestressed pipe hole and the prestressed pipe gap are filled with foamed glue.
10. The BIM-based construction method for positioning No. 0 block longitudinal prestressed pipes according to claim 1, wherein joints of the prestressed pipes are smooth, the length of the joints is not less than 10 times of the diameter of the prestressed pipes, the peripheries of the joints of the prestressed pipes are tightly wound with adhesive tapes to prevent grout from entering the prestressed pipes, positioning steel bars are additionally arranged on flat bending sections of the prestressed pipes, and the vertical distance between two adjacent positioning steel bars is 110-130 mm, and the transverse distance between two adjacent positioning steel bars is 130-150 mm.
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